This provides a mechanism for querying which paravirtualized features
are available in this hypervisor.
Also add the header file which defines the ABI for the paravirtualized
clock features we're about to add.
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
arch/arm64/include/asm/pvclock-abi.h | 32 ++++++++++++++++++++++++++++
include/kvm/arm_pv.h | 28 ++++++++++++++++++++++++
include/linux/arm-smccc.h | 1 +
virt/kvm/arm/hypercalls.c | 9 ++++++++
4 files changed, 70 insertions(+)
create mode 100644 arch/arm64/include/asm/pvclock-abi.h
create mode 100644 include/kvm/arm_pv.h
diff --git a/arch/arm64/include/asm/pvclock-abi.h b/arch/arm64/include/asm/pvclock-abi.h
new file mode 100644
index 000000000000..64ce041c8922
--- /dev/null
+++ b/arch/arm64/include/asm/pvclock-abi.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018 Arm Ltd. */
+
+#ifndef __ASM_PVCLOCK_ABI_H
+#define __ASM_PVCLOCK_ABI_H
+
+#include <kvm/arm_pv.h>
+
+struct pvclock_vm_time_info {
+ __le32 revision;
+ __le32 attributes;
+ __le64 sequence_number;
+ __le64 scale_mult;
+ __le32 shift;
+ __le32 reserved;
+ __le64 native_freq;
+ __le64 pv_freq;
+ __le64 div_by_pv_freq_mult;
+} __packed;
+
+struct pvclock_vcpu_stolen_time_info {
+ __le32 revision;
+ __le32 attributes;
+ __le64 stolen_time;
+ /* Structure must be 64 byte aligned, pad to that size */
+ u8 padding[48];
+} __packed;
+
+#define PV_VM_TIME_NOT_SUPPORTED -1
+#define PV_VM_TIME_INVALID_PARAMETERS -2
+
+#endif
diff --git a/include/kvm/arm_pv.h b/include/kvm/arm_pv.h
new file mode 100644
index 000000000000..19d2dafff31a
--- /dev/null
+++ b/include/kvm/arm_pv.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2018 Arm Ltd.
+ */
+
+#ifndef __KVM_ARM_PV_H
+#define __KVM_ARM_PV_H
+
+#include <linux/arm-smccc.h>
+
+#define ARM_SMCCC_HV_PV_FEATURES \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_HYP_STANDARD, \
+ 0x20)
+
+#define ARM_SMCCC_HV_PV_TIME_LPT \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_HYP_STANDARD, \
+ 0x21)
+
+#define ARM_SMCCC_HV_PV_TIME_ST \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_HYP_STANDARD, \
+ 0x22)
+
+#endif /* __KVM_ARM_PV_H */
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index b047009e7a0a..4e0866cc48c0 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -54,6 +54,7 @@
#define ARM_SMCCC_OWNER_SIP 2
#define ARM_SMCCC_OWNER_OEM 3
#define ARM_SMCCC_OWNER_STANDARD 4
+#define ARM_SMCCC_OWNER_HYP_STANDARD 5
#define ARM_SMCCC_OWNER_TRUSTED_APP 48
#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
#define ARM_SMCCC_OWNER_TRUSTED_OS 50
diff --git a/virt/kvm/arm/hypercalls.c b/virt/kvm/arm/hypercalls.c
index 153aa7642100..ba13b798f0f8 100644
--- a/virt/kvm/arm/hypercalls.c
+++ b/virt/kvm/arm/hypercalls.c
@@ -5,6 +5,7 @@
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
+#include <asm/pvclock-abi.h>
#include <kvm/arm_hypercalls.h>
#include <kvm/arm_psci.h>
@@ -40,6 +41,14 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
break;
}
break;
+ case ARM_SMCCC_HV_PV_FEATURES:
+ val = SMCCC_RET_SUCCESS;
+ break;
+ }
+ break;
+ case ARM_SMCCC_HV_PV_FEATURES:
+ feature = smccc_get_arg1(vcpu);
+ switch (feature) {
}
break;
default:
--
2.19.2
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